DISPOSITIF DE PROTECTION POUR LIGNE D'ARBRE

PROTECTIVE DEVICE FOR A DRIVESHAFT

Abrégé français

L'invention porte sur un dispositif de protection pour une ligne d'arbre 1, comportant deux joints universels 2, 3. Le dispositif de protection assure une protection complète, de façon à ce que le premier joint universel soit associé à un élément conique de protection 6 fourni avec un prolongement sous forme d'une partie conique 14 dans laquelle un manchon 15 est reçu d'une façon rotative rapide. Le manchon 15 coopère avec une bague d'adaptation 21 qui doit être fixée à une machine agricole de façon à être stationnaire. Le manchon 15 est placé sur la bague d'adaptation 21. Il comprend des clavettes dirigées vers l'intérieur qui s'engagent dans des rainures correspondantes 23 sur la face extérieure de la bague d'adaptation 21, de façon à effectuer une connexion rotative rapide. Les autres composants du dispositif de protection, par exemple le tube de protection raccordé au premier élément conique de protection 6 et le tube de protection associé au deuxième joint universel, s'engagent l'un l'autre d'une façon rotative rapide, tout en étant fermement raccordés au deuxième élément conique de protection au moyen d'un bouchon de fixation, ce dernier étant fixé au deuxième joint universel, le dispositif de protection complet demeure libre de rotation. La bague d'adaptation 21 et le manchon 15 qui doivent y être glissés facilitent la manutention.

Abrégé anglais

The invention relates to a protective device for a driveshaft 1,
which comprises two universal joints 2, 3. The protective device
provides complete protection, so that the first universal joint
is associated with a protective cone 6 which is provided with an
extension in the form of a cone portion 14 in which a sleeve 15
is received in a rotationally fast way. The sleeve 15 cooperates
with an adapter ring 21 which has to be secured to an
agricultural implement so as to be stationary. The sleeve 15 is
positioned on the adapter ring 21. It comprises inwardly directed
splines which engage correspondingly distributed grooves 23 in
the outer face of the adapter ring 21, so that a rotationally
fast connection is achieved. As also the remaining components of
the protective device, i.e. the protective tube connected to the
first protective cone 6 and the protective tube associated with
the second universal joint engage one another in a rotationally
fast way, while being firmly connected to the second protective
cone by means of an attaching cap, with the latter, together,
being secured to the second universal joint, the entire
protective device remains rotation-free. The adapter ring 21 and the
sleeve 15 to be slid thereon make handling easy.

Revendications

10
CLAIMS:
1. A protective device for driveshaft, especially a
universal-jointed driveshaft, with two universal joints
and a connecting shaft connecting the joints, the
connecting shaft being telescopic along a longitudinal
axis, each universal joint having a protective cone and
protective tube, said protective tubes being arranged
between said cones, said protective tubes being connected
to one another in a rotationally secure manner but
displaceable inside one another along the longitudinal
axis, one protective cone and one protective tube being
rotatably and axially immovably secured to one of said
universal joints, first securing means being rotatably
connectable to second securing means intended to be fixed
to a stationary part of a machine or a similar component,
wherein:
said first securing means with a sleeve firmly
connected to one of said protective cones, said second
securing means being an adapter ring, and, in an
assembled condition, said sleeve and said adapter ring
being arranged around one another and connected to one
another by holding means, said holding means enabling
longitudinal displacement of said sleeve and said adapter
ring in a rotationally secured manner relative to one
another.
2. A protective device according to claim 1, wherein
said sleeve has a bore with inwardly projecting splines
which extend parallel to the axis of the bore, and said
adapter ring has an outer face with a contour
corresponding to the bore and grooves which extend
parallel to the axis, with said grooves engaged by said
splines.

11
3. A protective device according to claim 1, wherein
said sleeve has a cylindrical outer face received in a
cylindrical receiving bore of a cone portion of the
protective cone.
4. A protective device according to claim 1, wherein
the outside of said adapter ring, toward the end of the
adapter ring close to the protective cone, presents at
least one projection which extends radially relative to
the axis and said sleeve, at the free end of said sleeve,
has a radially outwardly extending securing projection
which engages behind said at least one projection.

Description

CA 02249741 1998-10-07
Protective device for a driveshaft
Description
The invention relates to a protective device for a drivesha'ft,
especially a universal-jointed driveshaft, which comprises two
universal joints and a connecting shaft which connects said
joints and which is telescopic along a longitudinal axis, having
one each of a universal joint, a protective cone and protective
tubes, which protective tubes are arranged therebetween, which
are connected to one another in a rotationally fast way and
which are displaceable inside one another along the longitudinal
axis, with one protective cone and one protective tube each
being rotatably and axially immovably secured to a universal
joint, and having securing means which are provided at the first
protective cone and which are rotatably connectable to second
securing means intended to be fixed to the statienary part of a
machine or a similar component.
Protective devices are preferably used in connection with uni-
versal-jointed driveshafts which are used for driving agricul-
tural implements via the power take-off shaft of the tractor and
which, for that purpose, at one end, have to be connectable to
the power take-off shaft of the tractor and, at the other end,
are secured to a driving journal of the implement. The protecti-
ve device protects the driveshaft rotating therein from being
touched. The protective device can be secured by being connected
to a fixed point of the implement for example. However, it is
also known to provide one of the protective cones, at its free
end, with a flange from which there project axially circumferen-
tially distributed securing journals provided with undercuts.

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Said securing journals engage a slot in a securing element which
is connectable to the implement. Furthermore, the securing ele-
ment comprises a cone-shaped portion which is used for pre-cent-
ring the flange of the protective cone and which changes into a
cylindrical portion in which the flange of the protective cone
is centred. In this way, the securing journals projecting from
the end face are guided towards the corresponding openings in a
radially extending wall of the securing element. After said
securing journals are positioned so as to extend through the
corresponding slots, the securing operation is effected by rota-
ting the protective cone. The disadvantage of this design is
that handling the device is complicated because from the opera-
ting position it is practically impossible to see whether the
securing journals are engaged and, furthermore, it is necessary,
first, to find the rotational position which has to be assumed
by the protective cone with the securing journals relative to
the slots. It is not possible to be sure that locking has actu-
ally taken place, because due to the resilience of the protecti-
ve cone in the axial direction, the actual engagement of the
securing journals cannot be identified.
It is the object of the invention to provide complete protection
for driveshafts, so that all rotating components are completely
covered, and at the same time to ensure simple and safe handling
operations.
In accordance with the invention, the objective is achieved in
that the first securing means are provided in the form of a
sleeve which is firmly connected to the first protective cone,
that the second securing means are provided in the form of an
adapter ring and, that, in the assembled condition, the sleeve
and the adapter ring are arranged around one another and connec-
ted to one another by holding means which permit a longitudinal
displacement of the sleeve and the adapter ring relative to one
another and hold same in a rotationally fast way relative to one
another.

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The advantage of this embodiment is that because the sleeve and
adapter ring overlap one another, they can be engaged easily.
The portions which have to be made to engage one another are
within the field of vision of the operative.
According to a preferred embodiment, it is proposed that the
sleeve is provided with a bore comprising inwardly projecting
splines which extend parallel to the axis of the bore, and that
the adapter ring, on its outer face, is provided with a contour
corresponding to the bore, and comprises grooves which extend
parallel to the axis and which are engaged by the splines.
The grooves on the outer face of the adapter ring are easily
identifiable and in consequence, positioning of the splines is
also easy. The sleeve, by means of its cylindrical outer face,
is received in a cylindrical receiving bore of a cone portion
and connected thereto. The two parts can be connected by bolts
in order to achieve an adaptation on the spot. In this way, it
is possible to accommodate assembly-related differences in
length because the sleeve is displaceable in the receiving bore
of the cone portion. This is particularly important in cases of
retrofitting, but it is also possible to glue or cone the sleeve
to the weld portion. Furthermore, it is possible to provide
inter-engaging projections and indentations for connecting pur-
poses.
Because of the axial overlap of the sleeve and adapter ring, the
two parts are displaceable relative to one another. To prevent
an unintentional disconnection, it is proposed that the adapter
ring, towards its end close to the protective cone, on the out-
side, is provided with at least one projection which extends
radially relative to the axis and that the sleeve, at its free
end, is provided with a radially outwardly extending securing
projection which engages said former projection.
The components of the protective device are preferably produced
of plastics.

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The adapter ring can be secured on the gearbox neck of an input
of a gearbox in the region of the driving journal projecting
from the gearbox neck.
A preferred embodiment of the invention is diagrammatically
illustrated in the drawing wherein
Fig. 1 is a side view, half as a plan view and half in section,
of a driveshaft provided with a protective device in accordance
with the invention.
Fig. 2 is an illustration which is enlarged relative to Figure
1 and shows a universal joint completely covered by the protec-
tive cone and associated with a driving journal with a sleeve
and adapter ring.
Fig. 3 is a section III-III according to Figure 1.
Figure 1 shows a driveshaft 1 in the form of a universal-jointed
shaft which comprises a first universal joint 2 and a second
universal joint 3, as well as a connecting shaft 4 connecting
said two joints. In the illustration, all components are centred
on the longitudinal axis 5, i.e. the universal joints 2, 3 are
shown in the aligned condition. The connecting shaft 4 consists,
for example, of two profiled tubes which are inserted into one
another and which permit the transmission of torque between the
two universal joints 2, 3. In the embodiment as illustrated, the
drive is effected in that it starts from a journal (not visible)
via the second joint 3 and the connecting shaft 4 to the first
joint 2. The connecting shaft 4 permits changes in the distance
between the two universal joints 2 and 3.
When an agricultural implement is driven by the power take-off
shaft of a tractor, the driveshaft therebetween is exposed; in
consequence, a protective device is associated with the dri-
veshaft 1. The protective device comprises a first protective
cone 6 which fully covers the second joint 2. For this purpose,

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the protective cone comprises a cylindrical cone portion 14
which serves as an extension. When the second universal joint 3
is associated with a power take-off shaft for example, the pro-
tective cone 7 can be shorter because the tractor is usually
provided with a protective plate which extends over the protec-
tive cone 7. The first protective cone 6 is connected to an
attaching cap 10. In addition, the protective cap carries a
first protective tube 8 which extends parallel to the longitudi-
nal axis 5 and is inserted into a second protective tube 9 which
is connected to the attaching cap 11 which, in addition, carries
the second protective cone 7. The first attaching cap 10, by
means of a sliding ring 12, is held on the driveshaft 1 in a
groove of a joint yoke associated with the first universal joint
2, so as to be rotatable around the longitudinal axis 5. Howe-
ver, in the longitudinal direction, i.e. along the longitudinal
axis 5, the attaching cap 10 is secured by the sliding ring 12
relative to the joint yoke, thus permitting longitudinal move-
ments therewith. As a result of their shape, the two protective
tubes 8, 9 engage one another in a rotationally fast way. The
second protective tube 9 which, together with the second protec-
tive cone 7, is secured on the second attaching 11, is connected
by means of a second sliding ring 13 to a joint yoke associated
with the second universal joint 3 so as to be rotatable round
the longitudinal axis 5, but immovable along the longitudinal
axis 5. This means that the first protective cone 6 and the
second protective cone 7 carry out displacement movements toget-
her with the associated joints 2, 3, and their two protective
tubes 8 or 9 enter one another more or less deeply, depending on
whether the distance between the two universal joints 2, 3 is
increased or shortened.
By means of the sleeve 15 which will be explained in greater
detail below with reference to Figures 2 and 3, the protective
cone 6 is held so as to be rotationally fast around the longitu-
dinal axis 5. Because the protective cone 6 is firmly connected
by the first attaching cap 10 to the first protective tube 8,
and because of its non-rotating connection with the second pro-

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tective tube 9 and, via the second attaching cap 11, with the
second protective cone 7, it is ensured that the entire protec-
tive device is fixed relative to the driveshaft 1 rotating the-
rein around the longitudinal axis 5 for example, when the sleeve
15 is kept fast.
Figures 2 and 3 show the design of the securing means of the
first protective cone 6 and the way in which they cooperate with
the second securing means which are associated with the agricul-
tural implement for example.
Figure 2, in particular, makes it quite clear that the outer
joint yoke of the first universal joint 2 is positioned on the
driving journal 16 of an implement. For the sake of simplicity,
in this case, too, the universal joint 2 is shown in its aligned
position, so that the axis of rotation of the driving journal 16
coincides with the longitudinal axis 5. This also applies to the
receiving bore 17 of the cone portion 14 into which the sleeve
15 is inserted by means of its cylindrical outer face 20. Depen-
ding on the application, the sleeve 15 can enter the cone por-
tion 14 more or less deeply. The sleeve 15 is connected to the
cone portion 14 by a plurality of bolts 29 which are circumfe-
rentially distributed around the circumference of the cone por-
tion 14 and extend through the wall of same. In the bore 18 of
the sleeve 15, there are provided circumferentially distributed
splines 19 which project inwardly. The sleeve 15 is shown in a
position where it is slid by means of its bore 18 on to the
outer face 22 of the adapter ring 21. On its outer face 22, the
adapter ring 21 comprises grooves 23 which are circumferentially
distributed in accordance with the splines 19 of the sleeve 15
and which are engaged by the splines 19. The splines 19 and the
grooves 23 extend parallel to the longitudinal axis 15. The
adapter ring 21 comprises an inwardly directed wall portion and,
starting therefrom, a further portion which is sleeve-like and
serves to be slid over the gearbox neck 25. Furthermore, there
are provided fixing means 24, for instance in the form of a
tensioning strip in order to secure the adapter rin~ 21 on the

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gearbox neck 25. ~or this purpose, the sleeve-like region of the
adapter ring can be slotted or comprise projections which engage
a continuous groove in the gearbox neck 25.
The connection between the sleeve 15 and the adapter ring 21
also permits a relative movement between the two parts along the
longitudinal axis 5 to be able to carry out a compensating move-
ment when the first joint 2 is articulated. To permit only in-
tentional removal of the first protective cone 6 from the adap-
ter ring 21, the adapter ring 21, at its end entering the sleeve
15, is provided with one or several circumferentially distribu-
ted, outwardly projecting projections 26, whereas the sleeve 15,
at its free end 28, is provided with corresponding, radially
inwardly extending securing beads 27 which stop against the
projections 26. Only if the protective cone 6 is deliberately
acted upon by hand, is it possible to disengage said projections
26 by deformation.
...... .. ~ .... .. .

CA 02249741 1998-10-07
GKN Walterscheid GmbH October 08, 1997
Hauptstra~e 150 Hw/kau (0627)
53797 Lohmar P97037DE00
Protective device for a driveshaft
List of reference numbers
1 driveshaft
2 first universal joint
3 second universal joint
4 connecting shaft
longitudinal axis
6 first protective cone
7 second protective cone
8 first protective tube
9 second protective tube
first connecting cap
11 second connecting cap
12 first sliding ring
13 second sliding ring
14 cone portion
sleeve
16 driving journal
17 receiving bore
18 bore of the sleeve
19 splines
outer face
21 adapter ring
22 outer face
23 groove
24 fixing means
gearbox neck
26 projection
27 securing bead

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2 8 f ree end
29 bolt

Dessin représentatif